Aviation fuel quantity sensor measuring circuit based on triangular wave automatic windowing mechanism

Abstract

The invention provides an aviation fuel quantity sensor measuring circuit based on a triangular wave automatic windowing mechanism. The aviation fuel quantity sensor measuring circuit comprises a universal amplifier U1, a differential amplifier U2, a first comparator U3, a second comparator U4, an exclusive-OR gate U5, a multipath analog switch U6, an A/D acquisition chip U7, a microcontroller U8, a first resistor R1, a second resistor R2, a sampling resistor R3 and a fuel quantity sensor Cx. Wherein the positive electrode of the universal amplifier U1 is connected with a triangular wave initial excitation signal, and the negative electrode of the universal amplifier U1 is connected with one end of the first resistor R1; the other end of the first resistor R1 is grounded; the output end of the universal amplifier U1 is connected with one end of the second resistor R2, one end of the fuel quantity sensor Cx, the positive electrode of the first comparator U3 and the positive electrode of the second comparator U4. The other end of the second resistor R2 is connected with the negative electrode of the universal amplifier U1 and one end of the first resistor R1; the other end of the oil quantity sensor Cx is connected with one end of the sampling resistor R3 and the positive electrode of the differential amplifier U2.

Description

technical field [0001] The invention relates to the signal acquisition of an aviation fuel quantity capacitive sensor, in particular to an aviation fuel quantity sensor measurement circuit based on a triangular wave automatic window opening mechanism. Background technique [0002] The accurate collection of aviation fuel can reduce the amount of spare fuel when the aircraft takes off, and provide a more accurate reference for the formulation of aircraft tactics, which is of great significance to various aircraft types in the aviation field. At present, various aviation models use capacitive fuel quantity sensors, which can convert fuel quantity values ​​into pF-level capacitance values ​​for aviation computers to collect. Through special measurement circuit collection, circuit compensation, capacitance value calculation, weight calculation, flight attitude compensation and other steps, the remaining fuel volume of the entire aircraft can be calculated. [0003] To collect t...

AI Technical Summary

Problems solved by technology

Due to the many and complex distribution parameters on the transmission path of the aircraft fuel quantity signal, the traditiona

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